diff --git a/packages/protocol/src/protocol-bridge/decode.ts b/packages/protocol/src/protocol-bridge/decode.ts
index 84577b863e..c11605485b 100644
--- a/packages/protocol/src/protocol-bridge/decode.ts
+++ b/packages/protocol/src/protocol-bridge/decode.ts
@@ -14,12 +14,11 @@ const readHeader = (buffer: Buffer) => {
 };
 
 export const decode: TransportProtocolDecode = bytes => {
-    const buffer = Buffer.from(bytes);
-    const { messageType, length } = readHeader(buffer);
+    const { messageType, length } = readHeader(bytes);
 
     return {
         messageType,
         length,
-        payload: buffer.subarray(HEADER_SIZE),
+        payload: bytes.subarray(HEADER_SIZE),
     };
 };
diff --git a/packages/protocol/src/protocol-v1/decode.ts b/packages/protocol/src/protocol-v1/decode.ts
index 7387262494..160d084b24 100644
--- a/packages/protocol/src/protocol-v1/decode.ts
+++ b/packages/protocol/src/protocol-v1/decode.ts
@@ -21,7 +21,6 @@ const readHeaderChunked = (buffer: Buffer) => {
 };
 
 // Parses first raw input that comes from Trezor and returns some information about the whole message.
-// [compatibility]: accept Buffer just like decode does. But this would require changes in lower levels
 export const decode: TransportProtocolDecode = bytes => {
     // note: the occasionally appearing error "Attempt to access memory outside buffer bounds" comes from here in certain cases
     // when usb.transferIn (read) did not receive any data but resolved with success. bytes has byteLength 0 in this case.
@@ -29,8 +28,7 @@ export const decode: TransportProtocolDecode = bytes => {
         console.error('protocol-v1: decode: received empty buffer');
     }
 
-    const buffer = Buffer.from(bytes);
-    const { magic, sharp1, sharp2, messageType, length } = readHeaderChunked(buffer);
+    const { magic, sharp1, sharp2, messageType, length } = readHeaderChunked(bytes);
 
     if (
         magic !== MESSAGE_MAGIC_HEADER_BYTE ||
@@ -44,6 +42,6 @@ export const decode: TransportProtocolDecode = bytes => {
     return {
         length,
         messageType,
-        payload: buffer.subarray(HEADER_SIZE),
+        payload: bytes.subarray(HEADER_SIZE),
     };
 };
diff --git a/packages/protocol/src/types.ts b/packages/protocol/src/types.ts
index bdb801355a..309752a990 100644
--- a/packages/protocol/src/types.ts
+++ b/packages/protocol/src/types.ts
@@ -1,4 +1,4 @@
-export type TransportProtocolDecode = (bytes: ArrayBuffer) => {
+export type TransportProtocolDecode = (bytes: Buffer) => {
     length: number;
     messageType: number | string;
     payload: Buffer;
diff --git a/packages/transport-bridge/src/core.ts b/packages/transport-bridge/src/core.ts
index a69d6bfa7e..bc279bd554 100644
--- a/packages/transport-bridge/src/core.ts
+++ b/packages/transport-bridge/src/core.ts
@@ -61,9 +61,7 @@ export const createApi = (apiArg: 'usb' | 'udp' | AbstractApi, logger?: Log) =>
         data: string;
         signal: AbortSignal;
     }) => {
-        const { messageType, payload } = protocolBridge.decode(
-            new Uint8Array(Buffer.from(data, 'hex')),
-        );
+        const { messageType, payload } = protocolBridge.decode(Buffer.from(data, 'hex'));
 
         const encodedMessage = protocolV1.encode(payload, { messageType });
         const chunks = createChunks(